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Z-80 and 8080 assembly language programming by Kathe Spracklen

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By Kathe Spracklen

Publication through Spracklen, Kathe

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There is also a #pragma mark directive that’s useful with Xcode; I talk about it when discussing the Xcode programming environment (Chapter 9). Data Type Qualifiers A variable’s data type can be declared with a qualifier before the name of the type, modifying something about how that variable is to be used. 4) that it is illegal to change the variable’s value; the variable must be initialized in the same line as the declaration, and that’s the only value it can ever have. You can use a const variable as an alternative way (instead of #define) to prevent “magic numbers” and similar expressions.

Assignment to a pointer repoints the pointer. Suppose ptr1 and ptr2 are both pointers, and you say: ptr1 = ptr2; Now ptr1 and ptr2 are pointing at the same thing. Any change to the thing pointed to by ptr1 will also change the thing pointed to by ptr2, because they are the same thing. Meanwhile, whatever ptr1 was pointing to before the assignment is now not being pointed to by ptr1; it might, indeed, be pointed to by nothing (which could be bad). A firm understanding of these facts is crucial when working in Objective-C (Figure 1-1).

Here’s an example from my own code, which you can grasp even though we haven’t discussed Objective-C yet: + (CardPainter*) sharedPainter { static CardPainter* sp = nil; if (nil == sp) sp = [[CardPainter alloc] init]; return sp; } That code says: If the CardPainter instance sp has never been created, create it, and in any case, now return it. Thus, no matter how many times this method is called, the instance will be created just once and that same instance will be returned every time. Data Type Qualifiers | 29 CHAPTER 2 Object-Based Programming My object all sublime.

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